Version 6.6 571 October 2014
Installation & Operation Manual 40. General SIP Configuration
Parameter
Name
Type
Provisio
ning
Type
Description
History Info
Header
Enum
Disable, Enable
Instant Enables usage of the History-Info
header.
User Agent Client (UAC) Behavior:
Initial request: The History-Info
header is equal to the Request
URI. If a PSTN Redirect number is
received, it is added as an
additional History-Info header with
an appropriate reason.
Upon receiving the final failure
response, the gateway copies the
History-Info as is, adds the reason
of the failure response to the last
entry, and concatenates a new
destination to it (if an additional
request is sent).
The order of the reasons is as
follows:
Q.850 Reason
SIP Reason
SIP Response code
Upon receiving the final (success
or failure) response, the gateway
searches for a Redirect reason in
the History-Info (i.e., 3xx/4xx SIP
Reason). If found, it is passed to
ISDN according to the following
table:
302 – Call Forward Universal
(CFU)
408, 480, 487 – Call Forward No
Answer (CFNA)
486, 600 – Call Forward Busy
(CFB)
If history reason is a Q.850 reason,
it is translated to the SIP reason
(according to the SIP-ISDN tables)
and then to ISDN Redirect reason
according to the table above.
User Agent Server (UAS)
Behavior:
History-Info is sent in the final
response only.
Upon receiving a request with
History-Info, the UAS checks the
policy in the request. If 'session',
'header', or 'history' policy tag is
found, the (final) response is sent
without History Info Otherwise it
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